//
//  UIWindow+BFKit.m
//  BFKit
//
//  The MIT License (MIT)
//
//  Copyright (c) 2014 Fabrizio Brancati. All rights reserved.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//  SOFTWARE.

#import "UIWindow+BFKit.h"

@implementation UIWindow (BFKit)

- (UIImage *)takeScreenshot
{
    // Source (Under MIT License): https://github.com/shinydevelopment/SDScreenshotCapture/blob/master/SDScreenshotCapture/SDScreenshotCapture.m#L35
    
    BOOL ignoreOrientation = SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0");
    
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    
    CGSize imageSize = CGSizeZero;
    if (UIInterfaceOrientationIsPortrait(orientation) || ignoreOrientation)
        imageSize = [UIScreen mainScreen].bounds.size;
    else
        imageSize = CGSizeMake([UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width);
    
    UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSaveGState(context);
    CGContextTranslateCTM(context, self.center.x, self.center.y);
    CGContextConcatCTM(context, self.transform);
    CGContextTranslateCTM(context, -self.bounds.size.width * self.layer.anchorPoint.x, -self.bounds.size.height * self.layer.anchorPoint.y);
    
    // Correct for the screen orientation
    if(!ignoreOrientation)
    {
        if(orientation == UIInterfaceOrientationLandscapeLeft)
        {
            CGContextRotateCTM(context, (CGFloat)M_PI_2);
            CGContextTranslateCTM(context, 0, -imageSize.width);
        }
        else if(orientation == UIInterfaceOrientationLandscapeRight)
        {
            CGContextRotateCTM(context, (CGFloat)-M_PI_2);
            CGContextTranslateCTM(context, -imageSize.height, 0);
        }
        else if(orientation == UIInterfaceOrientationPortraitUpsideDown)
        {
            CGContextRotateCTM(context, (CGFloat)M_PI);
            CGContextTranslateCTM(context, -imageSize.width, -imageSize.height);
        }
    }
    
    if([self respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)])
        [self drawViewHierarchyInRect:self.bounds afterScreenUpdates:NO];
    else
        [self.layer renderInContext:UIGraphicsGetCurrentContext()];
    
    CGContextRestoreGState(context);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return image;
}

@end
